Circuit breaker



p 7, 1948. A. vAN RYAN 2,448,695

CIRCUIT BREAKER Filed July 24, 1944 5 Sheets-Sheet 1 I uvvavmn.

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A. VAN RYAN V CIRCUIT BREAKER 5 Sheets-Sheet 2 Filed July 24, 1944mvavrox. imam 144mm P 7, 1948. A. VAN RYAN 2,448,695

CIRCUIT 'BRIAKER Filed July 24, 1944 5 Sheets-Sheet 5 IN VEN TOR. 3III/I017) l/w/fw/v at im p 7, 1948. A. VAN RYAN 2,448,695

cmcurr BREAKER 7 Filed July 24, 1944 5 Sheets-Sheet 4 INVEN TOR.

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Filed July 24, 1944 A. VAN RYAN 2,448,695

CIRCUIT BREAKER 5 Sheets-Sheet 5 INVENTGR. 1 limo/w kw/Pw/v PatentedSept. 7, 1948 CIRCUIT BREAKER Anthony Van Ryan, South Milwaukee, Wis.,as-

signor to Line Material Company; a corporation of Delaware Application J1113 24, 1944, Serial No. 546,245 12 Claims. (Cl. 20089) This inventionrelates to circuit breakers.

Objects of this invention are to provide a circuit breaker which iscompletely housed in a metal can provided with a metal top, which isoperated either automatically or manually, and which when operated ineither manner has a very quick opening motion, which is positive in itsoperation, and which is so arranged that when it is in open position anoperating handle is positively moved to an indicating position, suchoperating handle serving the triple function of a manual opening means,a manual resetting means and an indicating means.

Further objects are to provide a circuit breaker in which all of themechanism is suspended from the top of the can, in which the can isfilled with oil and is devoid of openings through which oil may escape,and in which the can is adapted for mounting on a suitable support, thusallowin the cover with all of the suspended mechanism to be lifted fromthe can for inspection or repair of the mechanism.

Further objects are to provide a circuit breaker in which a plurality ofsprings are arranged to act directly on the associated parts actuatedthereby without the intervention of cams or other intermediate means, inwhich the moving parts are relatively light so that when the circuitbreaker is either manually or automatically tripped a quick openingmotion is secured, and in which the springs are so associated with theother elements of the mechanism that no spring acts in opposition to anyother spring during the opening motion of the circuit breaker but inwhich the springs coact in such a manner as to produce the quick openingof the circuit breaker.

Further objects are to provide a circuit breaker in which the operatinghandle is so associated with other portions of the mechanism that it istrip free so that the circuit breaker will automatically open eventhough the handle be held in circuit breaker closed position, in whichthere is no blow imparted to the handle when the circuit breaker opens,and in which the circuit breaker is arranged to automatically open underoverload conditions although the handle may be moving towards circuitbreaker closed position.

Further objects are to provide a circuit breaker which may be verycheaply constructed and which although having the desirable featureshereinabove enumerated is nevertheless of relatively simpleconstruction.

Embodiments of this invention are shown in the accompanying drawings, inwhich:

Figure l is a side elevation of the circuit breaker with a part insection.

Fig. 2 is a sectional view on the line 2-2 of Figures 1 and 4 showingthe circuit breaker in closed position.

Figure 3 is a sectional view on the line 3-4 of Figure 4 showing thecircuit breaker in closed position.

Figure 4 is a top plan view with parts broken away and parts in section,such view showing the upper portion of the mechanism and omittin thelower portion thereof for the sake of clearness.

Figure 5 is a sectional view on the line 5-5 of Figure 2.

Figure 6 is a sectional view corresponding to the lower portion ofFigure 3 and showing the parts in open position.

Figure '7 is a fragmentary view showing the parts in the position theyassume just after the circuit breaker has started to automatically open.

Figure 8 is a fragmentary view corresponding to Figure 7 but showing thehandle just prior to the completion of its manual opening motion.

Figure 9 is a view corresponding to Figure 7 showing the position of theparts after the circuit breaker has been opened either manually orautomatically.

Figure 10 is a fragmentary detail of a further form of the invention.

Referring to the drawings, particularly Figure 1, it will be seen thatthe circuit breaker is provided with a metal can I adapted to containoil and to house the parts of the circuit breaker. The can is providedwith a metal top 2 and with a pair of insulating bushings 3 and l whichcarry terminals 5 and 6, the terminal 5 being the load terminal and theterminal 6 the line terminal. Means, not shown, are provided forgrounding the can and top of the circuit breaker. A selfquenching sparkgap is provided between at least the line terminal 6 and the metal top 2of the housing and may consist of an upper downward- 1y projectingelectrode 1 housed within an inner fiber tube 8 surrounded by a Bakelitetube 9 and mounted immediately above a lower upwardly projectingelectrode ill. The can I is provided with any suitable type of bracket,such as shown at l l, whereby it may be secured to a support not shown.As will be seen from Figures 2 and 3, the insulating bushings 3 and 4extend downwardly through the top of the can and project below the oillevel indicated at l2.

The terminal 6 is connected to one of the stationary contacts indicatedgenerally by the reference character l3 in Figure 3. The otherstationary contact indicated generally by the reference character l4 inFigure 3 is connected to one side of a solenoid l5, the other side ofwhich is connected to the terminal 5. The stationary contacts I3 and I4are rigidly attached t rlgid supporting portions l6 and includerZsilient U-shaped conducting members I! terminating in contact membersl8 which, as shown in Figure 3, are provided with upwardly turned endportions abutting the ends of the U-shaped resilient members i1 and alsoforming a rounded outer face. Similar types of movable contact membersl9 are carried by the movable contact arms 20. The contact arms 28 arerigidly secured to channel-shapedmetal members 2| pivoted as indicatedat 22 and joined by means of a flexible conductor 23. The channelmembers 2| are pro vided with overlapping arms which are slotted asindicated at 24 and receive a pin 25 carried by a slide bar 28 formed ofinsulating material.

It is to be noted from Figures 3 and 6 that metal pins 21 are providedwhich act as stops for the movable contacts as shown in Figure 3 and forlimiting the motion of the stationary contacts as shown in Figure 6. Themovable and stationary contacts are carried in an invertedchannel-shaped housing 28 formed of insulating ;material and open at itssides and lower portion and spaced by means of a plurality of insulatlngpins 29, such pins acting also as insulating baffles to aid in thesuppression of the arc during opening of the circuit breaker, it beingnotedthat the housing 28 constitutes an arc chute and that there is amagnetic blow-out action due to the fact, as will be seen from Figure 3,that the circuit leading through the movable and stationary contactsconstitutes in effect a loop which tends to enlarge at the time thecircuit breaker is open, thus blowing the arc outwardly at oppositesides and against the insulating spacer pins 29. The are chute 28 ispreferably formed integral throughout and its lower portion is heldagainst opening outwardly by means of metal pins 30 whose ends arereduced and are riveted over in a well known manner. The pins 30 alsoact as stops to limit the opening motion of the movable contacts, as.

shown in Figure 6, and consequently act as stops to limit the upwardmotion of the insulating slide bar 26.

The insulating slide bar 23 is permanently biased upwardly towardsswitch open position by means of a pair of springs 3|, see Figure 3,whose lower ends are attached'to a pin 32 secured to the upper end ofthe slide bar 26, the upper ends of the springs being attached to atransverse pin 59'. The slide bar is guided by means of a slottedU-shaped metal plate 33 rigidly attached to the arc chute or insulatinghousing 28.

It is to be noted that the insulating housing is rigidly carried bymeans of a plurality of downwardly extending tubular insulating membersor pillars 34 whose upper ends are attached by means of threaded pins 35to bosses 38 formed integrally with the cover 2 and whose lower ends areattached by means of screws 31 to a pair of brackets 38 rigidly attachedto the arc chute or insulating housing 28 on one side thereof, seeFigure 2, and to a pair of outwardly looped fiber supporting members39,.see Figure 5, which support the solenoid and which are attached tothe magnetic frame or yoke 40 of the solenoid and to the insulatinghousing or are chute 28. The brackets 38 are preferably integral withthe supports I 3. The tubular insulating members are provided with upperand lower apertures so that they will be filled with oil to therebyincrease the insulation between the upper and lower ends thereof.

The solenoid construction, it will be seen from Figures 2, 5 and 8, isprovided with the metal yoke 40 which extends down opposite sides andacross the top of the solenoid and which is completed by means of amagnetic transverse bot tom portion 4| apertured to permit the passagetherethrough of the insulating tube 42 on which the solenoid I5 iswound. If desired, the tube 42 may be made integral with the upper andlower flanges 43 of the solenoid I5. A non-magnetic upper plate 44 issecured to the upper yoke portion of the solenoid and is provided withupstanding ears between which a fiber or other insulating cam like ortripping member 45 is pivotally mounted as indicated at 46. The centerof gravity of the tripping member 45 is to the left of the pivot 46, asviewed in Figure 2, so that the tripping member tends to remain in itsnontripping position. It is provided with an outer cam face 41 which isadapted to coact with toggle link mechanism hereinafter described.

The lower end of the lower link 48 of a toggle link mechanism is pivotedby means of the pin 32 to the insulating slide bar 26. This lower linkis composed of channel-shaped metal and its upper end is pivoted bymeans of the pin 50 to the lower end of the upper metal link 5| of thetoggle link mechanism.

The upper end of the upper link 5| of the toggle link mechanism rigidlycarries an upper pin 52 which is cut across along a diameter to providea flat face 53, as shown in Figures 2, '7, 8 and 9. The pin 52 ispivotally carried by a rock arm 54 which is integral with an oppositelyprojecting rock arm 55 and also integral with an upwardly extending ear56 to which one end of a spring 51 is attached, the other end of thespring being attached as indicated at 58 in Figure 2 to the cover 2. Itis to be noted that the springs 3| which urge the slide bar 26 upwardlyand the spring 5'! both act in the same sense, that is to say, they bothact in a manner tending to open the circuit breaker. Upward motion ofthe pin 52 is normally prevented by means of the latch lever 59 pivotedon the pivot pin 59', see Figures 2, 3, 7 and 8, suitable spacingsleeves being provided on the pin 59, as shown in Figure 3. The

latch lever 59 is provided with a flat face 60 normally in contact withthe flat face 53 of the pin 52 and with an upper shoulder 8| againstwhich the remaining part of the cut away portion of the pin 52 normallybears, as shown particularly in Figure 8. It is to be noted also thatthe latch lever 59 is provided with a projecting finger 62 and is springurged by means of the leaf spring 83 in a clockwise direction.

Normally the toggle link mechanism composed of the levers 48 and 5| isin a slightly over-center position so that the center of theintermediate pin 50 is slightly to the left of the line joining thecenter of the pins 32 and 52, seeFigure 2. The toggle link mechanismtends to collapse to the left under the influence of the springs 3|, butis prevented from so doing by means of the overhanging portion 64 of thechannel-shaped link 48 which overhanging portion bears against the sideof the link 5|. The link 5|, it is to be noted from Figures 2, '7, 8 and9, is provided with a projecting foot 65 which is located in closeproximity to the cam face 41 of the tripping member 45 and is adapted tobe pushed to the right as viewed in Figure 2 when the tripping member israised through the action of the solenoid l5 on the magnetic plunger 66.The magnetic plunger 56 is loosely slidably mounted in the insulatingtube 42 and is prevented from dropping through the open bottom thereofby means of a transverse pin 61. When the magnetic plunger 65 is raisedupon the flow of excess current through the solenoid l5, the upperprojecting pin 68 of such plunger rocks the tripping member 45 from theposition shown in Figure 2 to the right and thus initiates collapse ofthe toggle link mechanism and allows the springs 3| to become effectiveto continue collapsing motion of the toggle link mechanism,

The position of the parts in the early portion of the automatic openingmotion of the circuit breaker is shown in Figure '7.

Details of the operation from this point on will be given hereinafter.

The cam surface 4'! of the tripping member 45 is so contoured withreference to the foot 65 of the upper link 5| of the toggle linkmechanism that it is in close proximity to the foot portion 55 duringthe final portion of the closing motion of the circuit breaker so as toallow the circuit breaker to open even during the closing motion if anoverload exists.

It is to be noted from reference to Figure 2 that the plunger 66normally occupies its lowermost position being urged downwardly bygravity and also by means of a light spring 69 loosely coiled about areduced portion 19 of the plunger and bearing at its lower end against ashouldered part of the plunger and at its upper end against thenon-magnetic plate 44.

One form of condition responsive means responsive to overload conditionshas been shown but it is to be distinctly understood that other types ofcondition responsive means responsive to other conditions could beemployed.

A rock shaft 1| extends from the interior to the exterior of the cover 2and is carried in suitable bearings formed integrally with the cover, asindicated in Figure 4. The integrally formed rocking levers 54 and 55are loosely pivotally mounted on the rock shaft 1 At its outer end therock shaft 1| rigidly carries an eyeleted manipulating handle 12, seeFigure 4. A short lever 13 is rigidly secured to the rock shaft 1| andis located in close proximity to the lever 55 and is provided with alaterally extending lug 14 located below the lever 55. A spring 15, seeFigure 2, is interposed between the levers 55 and I3 and normally holdsthe lug 14 in contact with the lever 55, as shown in Figure 2. The leverI3 is provided with a projecting finger 16 which is adapted to engage astop 11, see Figure 2, to limit downward rocking motion of the handle.The

'lever 13 is also provided with a laterally projecting tripping portion18, see Figures 2 and 8, which is adapted to engage the finger 62 of thelatch lever 59 when the handle is pulled downwardly. The engagementbetween the projecting portion 18 of the lever 13 and the finger 62 ofthe latch lever 59 is just beginning in Figure 8.

The operation of the apparatus is as follows: Assume that the circuitbreaker is in closed position and that an overload occurs. The plunger55 is drawn upwardly into the solenoid I5 and the pin 88 thereof rocksthe trip member 45 from the position shown in Figure 2 to thepositionshown in Figure '7 and thus breaks the toggle 48 and 5| andinitiates collapse of the toggle. The springs 3| are now effective toproduce collapsing motion of the toggle, As the upper link 5| of thetoggle rocks as indicated in Figure '7,

the lower edge at the cut away portion of the pin 52 pushes the latchlever 59 to the right and the upper edge at such cut away portiondisengages itself from the shoulder 6| of the latch lever 59 and thusfrees the double armed rock lever 54 and 55. The spring 51 is noweffective and rocks the lever 54, 55 in a counterclockwise directionfrom the position shown in Figure '7 to the position shown in Figure 9.As previously described, the stop pins 30, see Figures 3 and 6, limitthe motion of the arms 20 and consequently limit the upward travel ofthe slide bar 26. It is obvious, therefore, that the rocking lever 54,55 straightens the toggle 48, 5|. A small spring 19 is loosely coiledabout the pin and opposite ends thereof bear against the links 48 and 5|of the toggle link and tend to straighten the toggle link and move itslightly past dead center to the position shown in Figure 9. The spring'19 shows in Figures 2, 7 and 8 but is hidden by the parts in theposition shown in Figure 9.

As the arm of the rock lever moves in a counterclockwise direction, itbears against the lug 14 of the short lever I3 and rocks such shortlever, and consequently the rock shaft, in a counterclockwise direction,the lever 13 and the rock lever 54, 55 moving as a unit. The rocking ofthe rock shaft 1| causes the handle 12 to move from its hidden positionwithin the housing 80, see Figure 4, downwardly to an exposed orindicating position, as shown in dot and dash lines in Figure 9, thusgiving anindication that the circuit breaker is open.

The circuit breaker is readily reset by pushing upwardly on the handle12 by means of a switch stick. The lug 14 of the lever 13 engages thelever 55 and rocks the lever 54 downwardly, thus closing the circuitbreaker and causing the pin 52 carried by the upper link 5| to again belatched by the latch lever 59.

When it is desired to manually open the circuit breaker, the operatinghandle 12 is engaged by a switch stick and is pulled downwardly. Thisdownward motion of the handle 72 rocks the rock shaft H and consequentlyrocks the lever 13 against the action of the spring 15, the floating orrock lever 54, 55 remaining in its initial position, as shown in Figure8, until the trip portion 18 of the lever 13 engages the finger 62 ofthe latch lever 59, as shown in Figure 8, and pushes such lever to theright, thus freeing the pin 52 and allowing quick opening of the circuitbreaker under the influence of the springs 3|, 51 and 15 withoutcollapse of the toggle link mechanism as all of these springs act in thesame sense tending to open the circuit breaker during manual opening.The parts are shown in the position where the trip portion 18 is justengaging the finger 62 of the latch lever 59, in Figure 8. Continueddownward motion of the handle causes disengagement of the latch lever 59from the pin 52, as described above. The final position of the parts isshown in Figure 9.

If it is desired to have a time delay action, this may be readilyaccomplished by partially closing the lower end .of the tube 42' bymeans of a cap 8| provided with a small aperture 82, as shown in Figure10. The tube 42 may be identical with'the tube 42 except that its lowerend is threaded to receive the cap 8|. It is apparent that upward motionof the plunger 66 is delayed by the restricted flow of oil into thespace beneath the plunger while the plunger is being raised. If desired,the upper portion of the tube 42' may be slightly enlarged so that the 7final upward motion of the plunger just as it is engaging the tripmember 55 may be very quick.

It will be seen that a simple and reliable type of circuit breaker hasbeen provided by this invention which is economical to build and whichis certain in its operation. It will be seen that when the circuitbreaker is tripped automatically on overload, the toggle link mechanismcollapses. Collapse of the toggle link mechanism is followed by theautomatic straightening of the toggle link mechanism. This gives a veryquick opening stroke to the circuit breaker. However, when the circuitbreaker is manually opened, it also has a very quick opening stroke asthe spring 51 rocks the rock lever 54, 55 from the position shown inFigure 7 to the position shown in Figure 9 and opens the clcruit breakerwithout'collapse of the toggle link mechanism, the springs 15 and 3|assisting in this operation.

It will be seen further that the springs act directly on the parts withwhich they are associated and do not act through the agency of cams orother means. It will also be seen that the moving parts of the circuitbreaker may be made very light and consequently will have very littleinertia, thus giving a quick action to the circuit breaker whethermanually or automaticall opened.

It is to be noted particularly with reference to the springs that theydo not oppose each other but each is wholly eflective to produce theoperation for which it is intended without opposition of any otherspring. This is particularly true of the springs 3| and 51. The spring15 normally holds the handle 12 in its uppermost or hidden position andholds the lug 14 of the lever I3 in contact with the lever 55, thespring 15, however, yielding when the circuit breaker is being manuallyopened as indicated in Figure 8 and finally bringing the lever 55 againinto contact with the lug 14 in the final open position as shown inFigure 9 after manual operation. During automatic operation the floatinglever 54, 55 and the short lever 13 rock as a unit to the position shownin Figure 9. It is to be noted that the springs 3|, 51 and I are alloperative in the same direction. The spring 15 aids in the openingmotion of the circuit breaker when manually operated. The spring 15normally holds the handle in its uppermost position and returns it tothat position should it be moved partially downward and thus preventsthe handle from remaining in an intermediate position.

It will be seen further that all of the effective parts of the circuitbreaker are freely removable from the can I as it is merely necessary toremove the cover 2 after removal of the securing means holding the coverin place so that the parts of the circuit breaker may be readilyinspected or repaired as desired. It is preferable to provide a rollededge 83 for the upper edge of the can I, which rolled edge engages agasket 84 carried inside of the downwardly extending flange 85 formedintegrally with the cover. It is also preferable to provide aninsulating lining 86 for the can I which lining occupies the interiorlower portion of the can.

Although this invention has been described in considerable detail, it isto be understood that such description is intended as illustrativerather than limiting, as the invention may be variously embodied and isto be interpreted as claimed.

I claim:

1. A circuit breaker comprising switch means,

normally extended toggle link mechanism'having one end operativelyconnected to said switch means, latch means normally holding the otherend of said toggle link mechanism from motion of translation, means fordetaching the said other end of said toggle link mechanism from saidlatch means when said toggle link mechanism executes collapsing motion,and means including condition responsive means for causing said togglelink mechanism to execute collapsing motion.

2. A circuit breaker comprising switch means, normally extended togglelink mechanism having one end operatively connected to said switchmeans, latch means normally holding the other end of said toggle linkmechanism from motion of translation, means operated by said toggle linkmechanism for detaching the said other end of said toggle link mechanismfrom said latch means when said toggle link mechanism executescollapsing motion, and means including condition responsive means forcausing said toggle link mechanism to execute collapsing motion.

3. A circuit breaker comprising switch means, normally extended togglelink mechanism having one end operatively connected to said switchmeans, latch means normally holding the other end of said toggle linkmechanism from motion of translation, means for detaching the said otherend of said toggle link mechanism from said latch means when said togglelink mechanism executes collapsing motion, means including conditionresponsive means for causing said toggle link mechanism to executecollapsing motion, and means for extending said toggle link mechanismand causing reengagement between the said other end of said toggle linkmechanism and said latch means.

4. A circuit breaker comprising switch means, normally extended togglelink mechanism having one end operatively connected to said switchmeans, latch means normally holding the other end of said toggle linkmechanism from motion of translation, means operated by said toggle linkmechanism for detaching the said other end of said toggle link mechanismfrom said latch means when said toggle link mechanism executescollapsing motion, means including condition responsive means forcausing said toggle link mechanism to execute collapsing motion, andmeans for extending said toggle link mechanism and causing reengagementbetween the said other end of said toggle link mechanism and said latchmeans.

5. A circuit breaker comprising switch means, normally extended togglelink mechanism having a first link and a second link, said second linkhaving its outer end connected to said switch means, latch meansnormally holding the outer end of said first link against motion oftranslation, means including condition responsive means for causing saidtoggle link mechanism to execute collapsing motion, said toggle linkmechanism being biased towards motion of translation, means forunlatching the outer end of said first link upon rocking motion of saidfirst link, and manual means for unlatching the outer end of said firstlink.

6. A circuit breaker comprising switch means, normally extended togglelink mechanism having a first link and a second link, said second linkhaving its outer end connected to said switch means, a pin rigid withthe outer end of said first link and having a projecting segmentalportion provided with a flat face and with corners, a latch lever havinga fiat face normally contacting the fiat face of the segmental portionof said pin and having a shoulder against which one corner of thesegmental portion of said pin bears, means biasing said toggle linkmechanism towards motion of translation and normally restrained by saidlatch lever, and means including condition responsive means for causingsaid toggle link mechanism to execute collapsing motion, the segmentalportion of said pin being rotated when said toggle link mechanism iscollapsing, whereby the normally latched corner of said segmentalportion moves away from the shoulder of said latch lever and anothercorner of said segmental portion pushes said latch lever towardsunlatching position.

7. A circuit breaker comprising switch means, normally extended togglelink mechanism having a first link and a second link, said second linkhaving its outer end connected to said switch means, a pin rigid withthe outer end of said first link and having a projecting segmentalportion provided with a fiat face and with corners, a latch lever havinga fiat face normally contacting the fiat face of the segmental portionof said pin and having a shoulder against which one corner of thesegmental portion of said pin bears, means biasing said toggle linkmechanism towards motion of translation and normally restrained by saidlatch lever, means including condition responsive means for causing saidtoggle link mechanism to execute collapsing motion, the segmentalportion of said pin being rotated when said toggle link mechanism iscollapsing, whereby the normally latched corner of said segmentalportion moves away from the shoulder of said latch lever and anothercorner of said segmental portion pushes said latch lever towardsunlatching position, and manual means for pushing said latch levertowards unlatching motion.

8. A circuit breaker comprising switch means, toggle link mechanismhaving a first link and a second link, the outer end of said second linkbeing connected to said switch means, a rock lever connected to theouter end of said first link, said toggle link mechanism normallyoccupying an extended positionv a first biasing spring biasing saidtoggle link mechanism towards motion of translation, a second biasingspring biasing said rock lever towards'rocking motion, a latch normallyrestraining said toggle link mechanism and said rock lever againsttranslatory and rocking motion respectively, condition responsive meansfor initiatin collapse of said toggle link mechanism, said first biasingspring acting to produce further collapsin motion of said toggle linkmechanism after initiation thereof, means for releasing said latch, stopmeans for limiting the translatory motion of said second link, saidsecond biasing spring causing said rock lever to straighten said togglelink mechanism, and means for rocking said rock lever to reset and closesaid circuit breaker.

9. A circuit breaker comprising switch means, toggle link mechanismhaving a firs't link and a second link. the outer end of said secondlink being connected to said switch means, a rock lever connected to theouter end of said first link, said toggle link mechanism normallyoccupying an extended position, a first biasing spring biasing saidtoggle link mechanism towards motion of translation, a second biasingspring biasing said rock lever towards rocking motion, a latch normallyrestraining said toggle link mechanism and said rock lever againsttranslatory and rocking motion respectively, condition responsive meansfor initiating collapse of said toggle link mecha nism, said firstbiasing spring acting to produce further collapsing motion of saidtoggle link mechanism after initiation thereof, means for releasing saidlatch, stop means for limiting the translatory motion of said secondlink, said second biasing spring causin said rock lever to straightensaid toggle link mechanism, and mm. oating means normally held inengagement with said rock lever and adapted to move to indicatingposition when said rock lever rocks as a result of the translatorymotion of said toggle link mechanism.

10. ,A circuit breaker comprisin switch means, toggle link mechanismhaving a first link and a second link, the outer end of said second linkbeing connected to said switch means, a rock lever connected to theouter end of said first link, said toggle link mechanism normallyoccupying an extended position, a first biasing spring biasing saidtoggle link mechanism towards motion of translation, a second biasingsprin biasing said rock lever towards rocking motion, a latch normallyrestraining said toggle link mechanism and said rock lever againsttranslatory and rocking motion respectively, condition responsive meansfor initiating collapse of said toggle link mechanism, said firstbiasing spring actin to produce further collapsing motion of said togglelink mechanism after initiation thereof, means for releasing said latch,stop means for limitin the translatory motion of said second link, saidsecond biasing spring causing said rock lever to straighten said togglelink mechanism, and indicating means normally operatively'spring held inengagement with said rock lever and adapted to move to indicatingposition when said rock lever rocks as a result of the translatorymotion of said toggle link mechanism, said indicating means beingmanually movable to reset and close said circuit breaker against theaction of said first and second biasing spring.

11. A circuit breaker comprising switch means, toggle link mechanismhaving a first link and a second link, the outer end of said second linkbeing connected to said switch means, a rock lever connected to theouter end of said first link, said toggle link mechanism normallyoccupying an extended position, a first biasing spring biasing saidtoggle link mechanism towards motion of translation, a second biasingspring biasing said rock lever towards rocking motion, a latch normallyrestraining said toggle link mechanism and said rock lever againsttranslatory and rocking motion respectively, condition responsive meansfor initiating collapse of said toggle link mechanism, said firstbiasing spring acting to produce further collapsing motion of saidtoggle link mechanism after initiation thereof, means for releasing saidlatch, stop means for limiting the translatory motion of said secondlink, said second biasing spring causing said rock lever to straightensaid toggle link mechanism, a rock shaft, a manually operable handlerigidly carried by said rock shaft, and a lever rigidly carried by saidrock shaft and having a projecting portion normally held in contact withsaid rock lever by spring means and movable by said rock lever when saidrock lever rocks as a result of the translatory motion of said togglelink mechanism, said manually operable handle when moved in onedirection causin resetting and closing of said circuit breaker.

12. A circuit breaker comprising switch means, toggle link mechanismhavin a first link and a second link, the outer end of said second linklever connected to the outer end of said first link,

said toggle link mechanism normally occupying an extended position, afirst biasing spring biasin said toggle link mechanism towards motion oftranslation, a second biasing spring biasing said rock lever towardsrocking motion, a latch normally restraining said toggle link mechanismand said rock lever against translatory and rocking motion respectively,condition responsive means for initiating collapse of said toggle linkmechanism, said first biasing spring acting to produce furthercollapsing motion of said toggle link mechanism after initiationthereof, means for releasing said latch, stop means for limiting thetranslatory motion of said second link, said second biasing sprincausing said rock lever to straighten said toggle link mechanism, a rockshaft, a manually operable handle rigidly carried by said rock shaft,and a lever rigidly carried 12 by said rock shaft and having aprojecting portion normally held in contact with said rock lever byspring means and movable by said rock lever when said rock lever rocksas a result of the translatory motion of said toggle link mechanism,said manually operable handle when moved in one direction causinresetting and closing of said circult breaker, the said lever rigid withsaid rock shalt having means for engaging and releasing said latch leverwhen said manually operable handle is rocked in the opposite direction.

ANTHONY VAN RYAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date Coy June 4, 1940 Number

